11A52: Difference between revisions

11A52 (view source)

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 See also the block diagram below.
-The 11A52 is very similar to the 11A32.  There are a few differences.  The difference in bandwidth (600 MHz vs 400 MHz) is due almost entirely to the difference in input attenuators.  The 11A52 50 Ω attenuator is passive and contains no amplifier.  Additionally the 11A52's M377 sees a 25 ohm source impedance (a terminated 50 ohm transmission line). The 11A32's M377 is driven by the 50 ohm output impedance of the [[M473]].
+The 11A52 is very similar to the 11A32.  There are a few differences.  The difference in bandwidth (600 MHz vs 400 MHz) is due almost entirely to the difference in input attenuators.  The 11A52 50 Ω attenuator is passive and contains no amplifier.  Additionally the 11A52's M377 sees a 25 ohm source impedance (a terminated 50 ohm transmission line). The 11A32's M377 is driven by the 50 ohm output impedance of the [[M474]].
 The [[11A32]] and [[11A34]] have only one transient response adjustment per channel.  This adjustment affects the high frequency response of all six of the M377's fixed gain settings (1 mV/div - 50 mV/ div).  The 11A52 has the added luxury of a high frequency adjustment for each of the M377's six gain settings to optimize the response at each setting.  These settings are  manually set under computer control and stored in NVRAM.  They need to be reset when the 11A52's NVRAM is replaced.  The NVRAM's internal battery typically lasts 20 to 30 years.